I had a bad experience with it also. Not with concrete but a real mess. My wife manages a 130 unit apart. complex and a has a slight grade going out back door 50' thru yard. Her corp. office had the domb ass idea to have me cut a a side walk area to parking lot and fill with red mulch. Okey im in business to make $ so i took my bobcat and made a single cut as told. Started at top adding red mulch got almost half way down and it started to rain. The parking lot from the run off looked like Charles Manson did his number on a few people ( yes a river of blood ). Well next day i got paid again to remove mulch and put in crushed stone for a sidewalk.
Mike

I was in the wood bus for 23 years. In most cases you are putting down hogged up pallets and other urban wood waste. the wood is old and the resins in the wood won't allow any stains to hold to it. some of the stains used will however stick to any clean surface. these same dyes are used in concrete colors. At First Class Grass we just say no to any customer that asks about this stuff.

I still have dyes from the "java brown" cedar on my driveway after 8 months. Good luck.

An entrepeneur is someone who takes a prospective employee to a hillside overlooking a great estate, points to the mansion, the swimming pool, the stables, the tennis courts and says, " If you come with me and work your butt off, someday, all of this WILL BE MINE" - Harvey Mackay

If simple green won't do it (haven't had many jobs that it won't) get some sulfuric acid (sold as muratic acid, driveway cleaner, some other names), a stiff push broom and protective waders, gloves, and goggles. Put the acid down and scrub at the stain. Use a pressure washer to clean the acid off and your done. Shoulden't take more than an hour start to finish, and if the customer is really upset about the drive way offer to split the cost to do the whole driveway depending on how big it is.

If simple green won't do it (haven't had many jobs that it won't) get some sulfuric acid (sold as muratic acid, driveway cleaner, some other names), a stiff push broom and protective waders, gloves, and goggles. Put the acid down and scrub at the stain. Use a pressure washer to clean the acid off and your done. Shoulden't take more than an hour start to finish, and if the customer is really upset about the drive way offer to split the cost to do the whole driveway depending on how big it is.

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How good (or not) is this stuff for the grass alongside the driveway?? I can recall being splashburned more than once putting it into our pool when I was a kid.